On Wednesday 15 June 2011, Michal Nazarewicz wrote: > On Tue, 14 Jun 2011 22:42:24 +0200, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > * We still need to solve the same problem in case of IOMMU mappings > > at some point, even if today's hardware doesn't have this combination. > > It would be good to use the same solution for both. > > I don't think I follow. What does IOMMU has to do with CMA? The point is that on the higher level device drivers, we want to hide the presence of CMA and/or IOMMU behind the dma mapping API, but the device drivers do need to know about the bank properties. If we want to solve the problem of allocating per-bank memory inside of CMA, we also need to solve it inside of the IOMMU code, using the same device driver interface. Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>